package com.lanou3g.code0516;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * Created by dllo on 18/5/16.
 */
@WebServlet(name = "WelcomeServlet", urlPatterns = "/welcome")
public class WelcomeServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        HttpSession session = request.getSession();
        String username = (String) session.getAttribute("username");
        if (username == null) {
            // 还没登入
            // 去登入页面登入 重定向
            response.sendRedirect(request.getContextPath() + "/user/login.jsp");
        } else {
            // 登入过了 请求转发
            request.getRequestDispatcher("/WEB-INF/welcome.jsp").forward(request, response);
        }
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        this.doPost(request, response);
    }
}
